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  <title>返回字符串中单词的使用情况</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.str-word-count" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">str_word_count</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">str_word_count</span> &mdash; <span class="dc-title">返回字符串中单词的使用情况</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.str-word-count-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>str_word_count</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$format</code><span class="initializer"> = 0</span></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$charlist</code></span>
  ]] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>

  <p class="para rdfs-comment">
   统计 <code class="parameter">string</code> 中单词的数量。如果可选的参数 <code class="parameter">format</code> 没有被指定，那么返回值是一个代表单词数量的整型数。如果指定了 <code class="parameter">format</code> 参数，返回值将是一个数组，数组的内容则取决于 <code class="parameter">format</code> 参数。<code class="parameter">format</code> 的可能值和相应的输出结果如下所列。
  </p>
  <p class="para">
   对于这个函数的目的来说，单词的定义是一个与区域设置相关的字符串。这个字符串可以包含字母字符，也可以包含 &quot;&#039;&quot; 和 &quot;-&quot; 字符（但不能以这两个字符开始）。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.str-word-count-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">string</code></dt>

     <dd>

      <p class="para">
       字符串。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">format</code></dt>

     <dd>

      <p class="para">
       指定函数的返回值。当前支持的值如下：
       <ul class="itemizedlist">
        <li class="listitem">
         <span class="simpara">
          0 - 返回单词数量
         </span>
        </li>
        <li class="listitem">
         <span class="simpara">
          1 - 返回一个包含 <code class="parameter">string</code> 中全部单词的数组
         </span>
        </li>
        <li class="listitem">
         <span class="simpara">
          2 - 返回关联数组。数组的键是单词在 <code class="parameter">string</code> 中出现的数值位置，数组的值是这个单词
         </span>
        </li> 
       </ul>
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">charlist</code></dt>

     <dd>

      <p class="para">
       附加的字符串列表，其中的字符将被视为单词的一部分。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.str-word-count-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回一个数组或整型数，这取决于 <code class="parameter">format</code> 参数的选择。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.str-word-count-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.1.0</td>
       <td>
        新增 <code class="parameter">charlist</code> 参数。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.str-word-count-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5961">
    <p><strong>Example #1 <span class="function"><strong>str_word_count()</strong></span> 范例</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$str&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"Hello&nbsp;fri3nd,&nbsp;you're<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;looking&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;good&nbsp;today!"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'àáãç3'</span><span style="color: #007700">));<br /><br />echo&nbsp;</span><span style="color: #0000BB">str_word_count</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Array
(
    [0] =&gt; Hello
    [1] =&gt; fri
    [2] =&gt; nd
    [3] =&gt; you&#039;re
    [4] =&gt; looking
    [5] =&gt; good
    [6] =&gt; today
)

Array
(
    [0] =&gt; Hello
    [6] =&gt; fri
    [10] =&gt; nd
    [14] =&gt; you&#039;re
    [29] =&gt; looking
    [46] =&gt; good
    [51] =&gt; today
)

Array
(
    [0] =&gt; Hello
    [1] =&gt; fri3nd
    [2] =&gt; you&#039;re
    [3] =&gt; looking
    [4] =&gt; good
    [5] =&gt; today
)

7
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.str-word-count-seealso">
  <h3 class="title">参见</h3>
   <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="explode.html" class="function" rel="rdfs-seeAlso">explode()</a> - 使用一个字符串分割另一个字符串</span></li>
    <li class="member"><span class="function"><a href="preg_split.html" class="function" rel="rdfs-seeAlso">preg_split()</a> - 通过一个正则表达式分隔字符串</span></li>
    <li class="member"><span class="function"><a href="split.html" class="function" rel="rdfs-seeAlso">split()</a> - 用正则表达式将字符串分割到数组中</span></li>
    <li class="member"><span class="function"><a href="count_chars.html" class="function" rel="rdfs-seeAlso">count_chars()</a> - 返回字符串所用字符的信息</span></li>
    <li class="member"><span class="function"><a href="substr_count.html" class="function" rel="rdfs-seeAlso">substr_count()</a> - 计算字串出现的次数</span></li>
   </ul>
  </p>
 </div>

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